| # Wrapper module for _socket, providing some additional facilities |
| # implemented in Python. |
| |
| """\ |
| This module provides socket operations and some related functions. |
| On Unix, it supports IP (Internet Protocol) and Unix domain sockets. |
| On other systems, it only supports IP. Functions specific for a |
| socket are available as methods of the socket object. |
| |
| Functions: |
| |
| socket() -- create a new socket object |
| socketpair() -- create a pair of new socket objects [*] |
| fromfd() -- create a socket object from an open file descriptor [*] |
| gethostname() -- return the current hostname |
| gethostbyname() -- map a hostname to its IP number |
| gethostbyaddr() -- map an IP number or hostname to DNS info |
| getservbyname() -- map a service name and a protocol name to a port number |
| getprotobyname() -- mape a protocol name (e.g. 'tcp') to a number |
| ntohs(), ntohl() -- convert 16, 32 bit int from network to host byte order |
| htons(), htonl() -- convert 16, 32 bit int from host to network byte order |
| inet_aton() -- convert IP addr string (123.45.67.89) to 32-bit packed format |
| inet_ntoa() -- convert 32-bit packed format IP to string (123.45.67.89) |
| ssl() -- secure socket layer support (only available if configured) |
| socket.getdefaulttimeout() -- get the default timeout value |
| socket.setdefaulttimeout() -- set the default timeout value |
| create_connection() -- connects to an address, with an optional timeout |
| |
| [*] not available on all platforms! |
| |
| Special objects: |
| |
| SocketType -- type object for socket objects |
| error -- exception raised for I/O errors |
| has_ipv6 -- boolean value indicating if IPv6 is supported |
| |
| Integer constants: |
| |
| AF_INET, AF_UNIX -- socket domains (first argument to socket() call) |
| SOCK_STREAM, SOCK_DGRAM, SOCK_RAW -- socket types (second argument) |
| |
| Many other constants may be defined; these may be used in calls to |
| the setsockopt() and getsockopt() methods. |
| """ |
| |
| import _socket |
| from _socket import * |
| |
| _have_ssl = False |
| try: |
| import _ssl |
| from _ssl import * |
| _have_ssl = True |
| except ImportError: |
| pass |
| |
| import os, sys, io |
| |
| try: |
| from errno import EBADF |
| except ImportError: |
| EBADF = 9 |
| |
| __all__ = ["getfqdn"] |
| __all__.extend(os._get_exports_list(_socket)) |
| if _have_ssl: |
| __all__.extend(os._get_exports_list(_ssl)) |
| |
| # WSA error codes |
| if sys.platform.lower().startswith("win"): |
| errorTab = {} |
| errorTab[10004] = "The operation was interrupted." |
| errorTab[10009] = "A bad file handle was passed." |
| errorTab[10013] = "Permission denied." |
| errorTab[10014] = "A fault occurred on the network??" # WSAEFAULT |
| errorTab[10022] = "An invalid operation was attempted." |
| errorTab[10035] = "The socket operation would block" |
| errorTab[10036] = "A blocking operation is already in progress." |
| errorTab[10048] = "The network address is in use." |
| errorTab[10054] = "The connection has been reset." |
| errorTab[10058] = "The network has been shut down." |
| errorTab[10060] = "The operation timed out." |
| errorTab[10061] = "Connection refused." |
| errorTab[10063] = "The name is too long." |
| errorTab[10064] = "The host is down." |
| errorTab[10065] = "The host is unreachable." |
| __all__.append("errorTab") |
| |
| |
| _os_has_dup = hasattr(os, "dup") |
| if _os_has_dup: |
| def fromfd(fd, family=AF_INET, type=SOCK_STREAM, proto=0): |
| nfd = os.dup(fd) |
| return socket(family, type, proto, fileno=nfd) |
| |
| |
| class socket(_socket.socket): |
| |
| """A subclass of _socket.socket adding the makefile() method.""" |
| |
| __slots__ = ["__weakref__"] |
| if not _os_has_dup: |
| __slots__.append("_base") |
| |
| def __repr__(self): |
| """Wrap __repr__() to reveal the real class name.""" |
| s = _socket.socket.__repr__(self) |
| if s.startswith("<socket object"): |
| s = "<%s.%s%s" % (self.__class__.__module__, |
| self.__class__.__name__, |
| s[7:]) |
| return s |
| |
| def accept(self): |
| """Wrap accept() to give the connection the right type.""" |
| conn, addr = _socket.socket.accept(self) |
| fd = conn.fileno() |
| nfd = fd |
| if _os_has_dup: |
| nfd = os.dup(fd) |
| wrapper = socket(self.family, self.type, self.proto, fileno=nfd) |
| if fd == nfd: |
| wrapper._base = conn # Keep the base alive |
| else: |
| conn.close() |
| return wrapper, addr |
| |
| if not _os_has_dup: |
| def close(self): |
| """Wrap close() to close the _base as well.""" |
| _socket.socket.close(self) |
| base = getattr(self, "_base", None) |
| if base is not None: |
| base.close() |
| |
| def makefile(self, mode="r", buffering=None, *, |
| encoding=None, newline=None): |
| """Return an I/O stream connected to the socket. |
| |
| The arguments are as for io.open() after the filename, |
| except the only mode characters supported are 'r', 'w' and 'b'. |
| The semantics are similar too. (XXX refactor to share code?) |
| """ |
| for c in mode: |
| if c not in {"r", "w", "b"}: |
| raise ValueError("invalid mode %r (only r, w, b allowed)") |
| writing = "w" in mode |
| reading = "r" in mode or not writing |
| assert reading or writing |
| binary = "b" in mode |
| rawmode = "" |
| if reading: |
| rawmode += "r" |
| if writing: |
| rawmode += "w" |
| raw = io.SocketIO(self, rawmode) |
| if buffering is None: |
| buffering = -1 |
| if buffering < 0: |
| buffering = io.DEFAULT_BUFFER_SIZE |
| if buffering == 0: |
| if not binary: |
| raise ValueError("unbuffered streams must be binary") |
| raw.name = self.fileno() |
| raw.mode = mode |
| return raw |
| if reading and writing: |
| buffer = io.BufferedRWPair(raw, raw, buffering) |
| elif reading: |
| buffer = io.BufferedReader(raw, buffering) |
| else: |
| assert writing |
| buffer = io.BufferedWriter(raw, buffering) |
| if binary: |
| buffer.name = self.fileno() |
| buffer.mode = mode |
| return buffer |
| text = io.TextIOWrapper(buffer, encoding, newline) |
| text.name = self.fileno() |
| self.mode = mode |
| return text |
| |
| |
| def getfqdn(name=''): |
| """Get fully qualified domain name from name. |
| |
| An empty argument is interpreted as meaning the local host. |
| |
| First the hostname returned by gethostbyaddr() is checked, then |
| possibly existing aliases. In case no FQDN is available, hostname |
| from gethostname() is returned. |
| """ |
| name = name.strip() |
| if not name or name == '0.0.0.0': |
| name = gethostname() |
| try: |
| hostname, aliases, ipaddrs = gethostbyaddr(name) |
| except error: |
| pass |
| else: |
| aliases.insert(0, hostname) |
| for name in aliases: |
| if '.' in name: |
| break |
| else: |
| name = hostname |
| return name |
| |
| |
| def create_connection(address, timeout=None): |
| """Connect to address (host, port) with an optional timeout. |
| |
| Provides access to socketobject timeout for higher-level |
| protocols. Passing a timeout will set the timeout on the |
| socket instance (if not present, or passed as None, the |
| default global timeout setting will be used). |
| """ |
| |
| msg = "getaddrinfo returns an empty list" |
| host, port = address |
| for res in getaddrinfo(host, port, 0, SOCK_STREAM): |
| af, socktype, proto, canonname, sa = res |
| sock = None |
| try: |
| sock = socket(af, socktype, proto) |
| if timeout is not None: |
| sock.settimeout(timeout) |
| sock.connect(sa) |
| return sock |
| |
| except error as err: |
| msg = err |
| if sock is not None: |
| sock.close() |
| |
| raise error(msg) |